SMC KJU06-00 fitting, union y, KJ MINI ONE TOUCH sold in packages of 10; price is per piece
One-Touch mini fittings series KJ is available for use with miniature valves and actuators, M3 and M5 ported. Their compact one-touch collet design allows easy disassembly with strong tube gripping. Electroless nickel plating is standard.
Allied Electronics:
FITTING, MINI, Y, FOR 6MM TUBE